In fact, this container was in service inextreme climatic conditions with temperatures frequently reaching −30 to −40 C. Along the cracks, several fractographic ribmarks could be observed which indicated the crack growth direction, and that the cracks arrested multiple times between the origin and the termination points. This indicated that the fracturedevelopment was not from one single event, but from severalevents which caused the crack to propagate. One of the ribmarks, located in Area 1 of Figure 1, is shown magnified inFigure 15. The shape of the rib mark reflects the shape of thecrack front during propagation.
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